I got my first Bionicle set in 2007 or something (it was Mahri Nuparu), and I actually found the story quite easy to jump into. I found out about the Phantoka, and did a bit of research, read the books and comic books, played the online games frequently, and soon I considered myself a Bionicle expert. I was seven or six at the time, so now I know better. But what I'm saying is, I found the story pretty easy to jump into. My brother actually jumped into the story after Bionicle was canceled, and he was just fine. Granted, I come from a family of huge geeks and smart people so... I don't know if that helped or not...